Underworld Fanfiction Crossover

Cassie Reed never imagined that a routine day at college would end with her being kidnapped by a ruthless mafia boss. She’s thrown into a dangerous world she doesn’t understand—one ruled by Luca, a cold and powerful man who claims she holds a secret worth killing for. Forced to live as his secret roommate, Cassie is trapped in a shadowy underworld where every move could mean life or death. Luca is controlling, mysterious, and infuriatingly distant. As threats from rival families close in, Cassie must unravel the truth behind her father’s hidden past and the secret slush fund that could destroy them all. He says keeping her close is for her protection. But Cassie wonders… is she his prisoner—or his greatest weakness?

Bound by debt and haunted by a past she can't speak of, Annamaria is offered as a bride to Ares de Luca Sinclair, the ruthless head of the Sicilian mafia. He needs her secret; she craves revenge. Ares believes Annamaria holds the key to stopping a Russian mob invasion, but he doesn't know she blames him for her family's massacre and has vowed to get her revenge on him. As their lives intertwine, the lines between enemy and lover blur. But their fragile bond is threatened by a vengeful half-brother hungry for Ares's power, a scorned woman determined to reclaim her place by his side, and a forbidden love that refuses to be denied. When the truth is finally revealed, Annamaria finds herself a pawn in a deadly game. Kidnapped and tortured, she's forced to confront the secrets she's desperately trying to protect. Ares, consumed by betrayal, unleashes his fury, unaware he's playing right into the hands of his enemies. Will their love survive the lies, the betrayals, and the ever-present threat of the mafia underworld? Or will their dangerous dance end in heartbreak and ruin?

Beneath the charming harbor town of New Haven lies a world ruled by kingpins—where empires rise and fall, love is a dangerous game, and betrayal exists in every corner.- Tag Cassandra Reed is no stranger to survival. Between being an underground deliveryman, waitress by day, and stripping at The Velvet Mirage by night, her life is a delicate balance of secrets and sacrifices—all for the sake of her mother’s medical bills. But one fateful night, everything changes. A mysterious man ends up dead in her arms, and Cassandra becomes the prime suspect in a murder that pulls her into the dark, dangerous underworld of New Haven’s mafia elite. Alexander Wolfe is cold, calculating, and determined to avenge his family’s downfall. Cassandra might hold the key to uncovering the conspiracy that threatens his empire, but her defiance and vulnerability stir something he thought he’d buried long ago. As the walls between captor and captive crumble, a deadly game of trust, betrayal, and passion begins. Together, they unravel a web of secrets tied to a stolen ledger, corrupt politicians, and a rival mafia boss with a thirst for domination. But as enemies close in, Cassandra must make an impossible choice: sacrifice her freedom to protect the man who’s captured her heart or risk everything to take down the woman who destroyed her life. In this world, love is dangerous, loyalty is deadly, and power comes at a price. Can two fractured hearts survive a war built on vendetta? Or will their love be consumed by the shadows of desire? Perfect for fans of dark romance and thrilling mafia story, His Shadowed Desires delivers unexpected twists, unforgettable characters, and a love story forged in the least likely of places. Prepare to be captivated until the very last page.

She chased a rich man for revenge. She collided with a mafia king instead. Ophelia Barclay has spent her entire life playing by the rules of a family that never wanted her. Now, after a humiliating betrayal by her fiancé and stepsister days before her wedding, she’s done playing nice. Revenge is the only thing on her mind, and she knows exactly how she’ll get it: find a rich, powerful man who can elevate her beyond the Barclays’ reach, and leave them choking on the dust of her success. First-class flights become her hunting ground. But when she meets Ludwig Gallo, a man whose presence steals the very air from her lungs, her plans unravel before they even begin. He's everything she’s been looking for: dangerous, devastatingly handsome, and so wealthy it hurts to breathe near him. The problem? He doesn’t even glance her way. Humiliated and desperate, Ophelia thinks she’s lost everything… until fate throws her right into Ludwig’s world. Tracking a lost necklace, her most treasured possession, she finds herself sneaking into the heavily guarded Gallo estate, only to be captured by the mafia king himself. Mistaken for a spy, imprisoned in enemy territory, Ophelia’s survival instincts kick in. When Ludwig proposes a deal to pretend to be his girlfriend to silence rumours that have driven his mother into depression, Ophelia sees an opportunity. She’ll play the doting lover, smile for the cameras, win the favour of one of the most feared families in the underworld… and use Ludwig's wealth and power to destroy everyone who wronged her. But Ophelia didn’t plan on Ludwig being more than just a cold-blooded king. Beneath his ruthless exterior, she finds a man haunted by a violent past.

Once a helpless girl, now the most feared assassin in the underworld—Sameera Ashar knows how to survive. But when she’s framed for the murder of billionaire Vaughn Steele’s wife, survival isn’t enough. She needs revenge. Vaughn should’ve known better than to trust the evidence. But blinded by fury, he hunts Sameera down, forcing her into a marriage built on deception and control. She’s his prisoner, his obsession… but never his victim. Yet, beneath the hatred, the stolen glances, and the war between dominance and defiance, desire sparks. The more Vaughn tries to tame her, the more she consumes him. And when the truth unravels, leaving them both exposed, he realizes too late—Sameera was never his to break. Now, with enemies closing in and a love as dangerous as the secrets between them, the hunter is about to become the prey.

Milo Petrov ruled Russia’s underworld with an iron fist. For years, I was nothing more than his possession—his plaything, his captive. His wealth and dangerous charm ensnared me, but I couldn’t escape the truth: I was nothing more than a pawn in his game. At just 19 years old, I never imagined my life would spiral so far out of control. He was ruthless, but everything about him intrigued me. The only problem? I had once loved his son, Andrew. Now I found myself torn between the deadly allure of Milo and the guilt of betraying Andrew, my first love. Could blood really be thicker than desire? My name is Emilie, and this is the twist story of how Milo Petrov took my heart and shattered my world.

Cravings was all it took… One moment, Samuel Preston was an ordinary college student. The next, he was snatched from his dorm room and thrown into the ruthless underworld of (THE BIDEN), an underground syndicate led by the elusive and brutal Teddy Vietnam. Known for trafficking drugs, dealing weapons, and orchestrating chaos against the military, The Biden doesn’t take no for an answer. Especially not from recruits. But Samuel isn’t just any recruit. He’s the son of the nation’s Chief of Defense Staff,a secret that could either be his greatest weapon or the reason he never sees daylight again. Determined to escape, Samuel does everything to sabotage their operations, only to catch the attention of Teddy himself. Cold, cunning, and feared by all… Teddy finds himself obsessively drawn to Samuel's fire, his resistance, his cravings for freedom. Trapped between a powerful man’s dangerous affection and the desperate yearning to return to his real life, Samuel must play a deadly game. Because in The Biden, love is war, freedom is forbidden, and craving the wrong thing might just get you killed. A dark romance thriller where power, passion, and rebellion collide.

Two alpha males. One forbidden siren. A bond that breaks every rule. Althea Lake has always known she was dangerous. As a siren, her beauty and voice were crafted by nature to lure powerful mates—and in a world ruled by dominance and legacy, sirens are both coveted and feared. Desired by kings, claimed by titans, and whispered about in secret, they are walking temptation. But Althea isn’t hunting for power. She’s hiding from it. That is, until fate brings her face-to-face with the two most dangerous—and unclaimed—males in the supernatural world. Cassian Morningstar, the Demon King of the underworld and a cold-blooded CEO by day, built his empire with ruthless control. Xanden Moon, a deadly fae warrior and Cassian’s co-ruler, is known for his loyalty, precision, and barely leashed violence. Neither has ever found their fated mate. Until her. Althea is theirs. The bond is undeniable. But a siren having two mates? Unheard of. Forbidden. And potentially catastrophic for the balance of power in their world. Torn between her fear of being claimed and the impossible heat pulling them together, Althea must decide whether to resist her nature—or surrender to a destiny that could consume them all. In a world of magic, power, and primal instincts… some rules were made to be broken.

They called her a burden. His fiancè called her a nuisance. Cecelia Morrow was a pawn of her family, sacrificed for their wealth and power. When she caught her fiancé in bed with her sister, the day before their wedding, her desperate plea to escape was met with disapproval. Forced to choose between a loveless marriage and a life of hate and misery, she made a desperate call to her childhood friend, the one person she knew could help her disappear. He was the king of the underworld, a man who hated women. But tonight, everything changed. Lucien Belucci, the infamous Mafia King, had never met a woman who could tempt him, but on his way to a wedding arranged by his brother, he encountered a runaway bride and for some reason, his man that he could never get up was now hard in anger. So when she demanded for his help, he took the chance. "What do you think about getting married today?" A dangerous alliance. A desperate escape. Their worlds collide in a storm of betrayal and passion. Two souls, bound by circumstance and driven by a need for lust and freedom, find themselves in a deadly game where love and revenge become intertwined. Will their escape lead to a new life, or will they be consumed by the darkness they've unleashed?

Isabella’s Herrera’s world unravels when her father’s reckless dealings with the notorious mafia boss Lorenzo Castillo leave her family drowning in debt. With her younger brother’s life hanging by a thread, Bella is forced into a dangerous bargain: herself as payment for her father’s sins. Lorenzo Castillo is a ruthless and calculating man, hardened by the violent underworld he controls. Bound by a code of power and loyalty, he has no room for emotions—until Bella’s fiery spirit and unwavering determination begin to chip away at his cold exterior. As the contract between them deepens, so does the dangerous attraction that neither can ignore. But Bella’s past is riddled with secrets, and as she navigates the shadows of Lorenzo’s empire, she discovers that not everything is what it seems. A rival mafia leader, Gabriel Moretti, is hell-bent on taking over Lorenzo’s empire, and Bella becomes the key to his plot. With her life now at the mercy of two powerful men, Bella is caught between love, loyalty, and survival. In the world of betrayal and bloodshed, can a debt born from desperation ignite a passion that could either save or destroy them both? A Debt of Passion is a gripping tale of forbidden love, power, and redemption, where every choice comes with a deadly cost, and every heart is a battlefield.